The Babylonian king reaches the absolute height of arrogance and pride by blending the desecration of holy Temple vessels with drunkenness and idol worship. During a royal feast, the king and his guests drink wine from these sacred items, using them to praise mute idols crafted from gold, silver, copper, iron, wood, and stone [מצודת דוד, ביאור שטיינזלץ]. The very act of drinking from these holy vessels is a profound disgrace, as wine naturally leads to mockery and intoxication [מלבי״ם].
However, the offense goes much deeper than merely repurposing the vessels for a banquet. The participants intentionally drink wine dedicated to idols with the explicit goal of angering God [אלשיך]. The intoxication itself fuels their behavior, prompting them to praise their false gods immediately after consuming the wine [אלשיך]. This praise is specifically intended to celebrate their perceived victory over the Israelites [יוסף אבן יחיא].
Through this celebration, the king and his court engage in open defiance. They act as though their lifeless idols have conquered the God of Israel, attempting to show that His promises and prophecies regarding the impending fall of Babylon have been nullified [מלבי״ם, אלשיך]. By attributing the success and survival of their kingdom to blind, unthinking objects of metal, wood, and stone, they actively seek to defile God's majesty [אלשיך].
This extreme arrogance involves drinking from the sacred vessels of the Creator while singing hymns to ordinary wood and stone. The participants act in total disregard of the fact that God sees and hears everything. Ultimately, this blatant disrespect awakens His anger, triggering the immediate punishment that falls upon the king [אלשיך, יוסף אבן יחיא].